We're dividing 515590 by 90 
Let's see how many times 90 fits into 515590.

On to step 1:
90 can be fit into 5 0 times, resulting in a remainder of 5.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 5, we get 5.
Bring next digit (1) of the dividend behind the 5 and repeat the process: 51 / 90

Moving on to step 2:
90 can be fit into 51 0 times, resulting in a remainder of 51.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 51, we end up with 51.
Grab the next digit (5) from the dividend, add it to 51, then carry on: 515 / 90

Let's proceed to step 3:
515 divided by 90 is 5 with a remainder of 65.
Put 5 as the next digit of the answer. 
Result so far: 5.0
Subtracting 450 from 515 leaves us with 65.
Append the next digit (5) from the dividend to 65 and continue with: 655 / 90

Going ahead to step 4:
The number 90 fits into 655 7 times, leaving a remainder of 25.
Put 7 as the next digit of the answer. 
Result so far: 57.0
If we subtract 630 from 655, we get 25.
Include the next digit (9) from the dividend after 25, then repeat: 259 / 90

On to step 5:
90 goes into 259 2 times with a remainder of 79.
Write down 2 as next digit of the result. 
Result so far: 572.0
If we subtract 180 from 259, we get 79.
Include the next digit (0) from the dividend after 79, then repeat: 790 / 90

Moving on to step 6:
The number 90 fits into 790 8 times, leaving a remainder of 70.
The next digit of our result is 8. 
Result so far: 5728.0
Subtract 720 from 790 to get 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

Moving on to step 7:
When dividing 700 by 90, we get 7 with a remainder of 70.
Put 7 as the next digit of the answer. 
Result so far: 5728.7
Subtract 630 from 700 to get 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

On to step 8:
90 goes into 700 7 times with a remainder of 70.
Write down 7 as next digit of the result. 
Result so far: 5728.77
If we take 630 away from 700, we end up with 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

The final result is 5728.77 with a remainder of 0.07.